Improvement in tweers of blast-fttrnaces



waited, tang,

@ie/latent- @Mitre THOMAS W. MCcUNE.l or PITTSBURG, PENNSYLVANIA.

Letters Patent No. 102,844, (lated May 10. 1870.

To all whom it may concern:

Be it known that I, THOMAS W. McOuNn, of Pittsburg, in the county of Allegheny and State ot Pennsylvania, have invented a new and useful Improvement in Blast-Furnaces; andI do hereby declare the following to be a full, clear, and 'exact description thereof, reference being had to the accompanying drawings making a part ot' this specification, in which- Figure 1 is a perspective view of a section of a blast-furnace Figure 2 is a-verticnl section through the line x-x, iig. 1; and

Figures 3 and 4 show, in detached views, the construction of the breast-plate and water-plate.

Like letters of reference indicate like parts in each.

My invention relates vto the construction of cupola for blast-furnaces, and consists, particularly, in irnprovenient-s in the tweer-attaehments, whereby such .ttachments are rendered more serviceable and dura- To enable those skilled in the art to make and use my invention, I will proceed to describe its construction and mode of operation.

The breast a is made in the usual way, as also is the tweer-arch b and main ring c, on which the lining rests.

The tweer al may also be of the usual or any known construction. Y

Heretotore, iu such cnpolas, it has been found that the action of the heat inside on the breast a', below the place ot' inserting the tweer, and to a less degree above and immediately around the tweer, was to burn out the breast, and let the tweer fall down, or otherwise become misplaced. This often renders it necessary to rebuild the lower part of the furnace, simply in order to secure the tweers in place, when, had there been any independent way of keeping the tweers in place, the furnace might have been used much longer.

In my invention, I obviate these evils, first, by iuserting each tweer through an iron breast-piece, j,

which latter is set vertically in or under the tweel-v arch b,- second, by supporting each breast-piece f by a'pl'atc, g, which has a bearing on the brick-work h of the cupola Far enough back so that it will not be lia- 'bleto displacement, even when'the lower part of the breast a is burnt out, the plate g being braced, at or near its rea-r end, from above, by means of posts fi, which bear, at their upper ends, against the main ring c, or some part of the brick-Work and, third, by making the breast-piece fand supporting-plate g with water-pipe e extending through them, so that a constant stream or flow of water may be passed through them, not only to keep them at a comparatively low temperature, but also so as to protect the brick-workcontignous thereto from the injurious or burning-out action of the heatvinside.

These water-passages e are made in the casting of the breast-plate fand supporting-plate. g in any of the ways known to the art. They'may extend through in one or more coils, at pleasure, and in any desired direction; and at their outer ends they are connected with supply and discharge-pipes, in the usual way. This arrangement I apply to each of the tweers.

By the construction described, I increase greatly 'the durability of thefurnaee, and correspondingly lessen the cost of the manufacture of the iron.

Vhat I claim as my invention, and dgsire'to secure by Letters Patent, is l. A breast-plate, f, having passages through it for a stream or ow ot-water as a support for a blast-furnace tiveer, substantially as described.

2. A supporting-plate, g, having water-passages, in combination with a breast-plate, f, and braces 1'., arranged substantially as described.

In testimony whereof, I, the said THoMAsW. Mc- CINE, have hereunto set my hand.

THOMAS W. MCCUNE.

` Witnesses:

. JOHN GLENN, Taos. B. KERK. 

